20"

B C 72 dB

A B 72 dB

C A 73 dB

B A 71 dB

A B 72 dB

C C 73 dB

C A 73 dB

D A 73 dB

C E 70 dB

C A 72 dB

C A 71 dB

D B 72 dB

B A 70 dB

C B 72 dB

A B 69 dB

D B 71 dB

C A 74 dB

D C 73 dB

B A 71 dB

C C 71 dB

C A 72 dB

C C 73 dB

B A 72 dB